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tftp - trivial file transfer program




tftp [host [port]]


The tftp utility is the user interface to the Internet TFTP (Trivial File Transfer Protocol), which allows users to transfer files to and from a remote machine. The remote host may be specified on the command line, in which case tftp uses host as the default host for future transfers (see the connect command below).


Once tftp is running, it issues the prompt "tftp>" and recognizes the following commands:

? command-name ...
Print help information.

ascii Shorthand for "mode ascii"

binary Shorthand for "mode binary"

connect host [port]
Set the host (and optionally port) for transfers. Note that the TFTP protocol, unlike the FTP protocol, does not maintain connections between transfers; thus, the connect command does not actually create a connection, but merely remembers what host is to be used for transfers. You do not have to use the connect command; the remote host can be specified as part of the get or put commands.

get[host:file [localname]]
get Xo
[host1:file1] [host2:file2 ...] [hostN:fileN]
Get one or more files from the remote host. When using the host argument, the host will be used as default host for future transfers. If localname is specified, the file is stored locally as localname, otherwise the original filename is used. Note that it is not possible to download two files at a time, only one, three, or more than three files, at a time.

To specify an IPv6 numeric address for a host, wrap it using square brackets like "[3ffe:2900:e00c:ffee::1234]: file" to disambiguate the colons used in the IPv6 address from the colon separating the host and the filename.

mode transfer-mode
Set the mode for transfers; transfer-mode may be one of ascii or binary. The default is ascii.

put file [[host:remotename]]
put file1 file2 ... fileN [[host:remote-directory]]
Put a file or set of files to the remote host. When remotename is specified, the file is stored remotely as remotename, otherwise the original filename is used. If the remote-directory argument is used, the remote host is assumed to be a Unix machine. To specify an IPv6 numeric address for a host, see the example under the get command.

quit Exit tftp. An end of file also exits.

rexmt retransmission-timeout
Set the per-packet retransmission timeout, in seconds.

status Show current status.

timeout total-transmission-timeout
Set the total transmission timeout, in seconds.

trace Toggle packet tracing.

Toggle verbose mode.


The tftp command appeared in BSD 4.3 .


Because there is no user-login or validation within the TFTP protocol, the remote site will probably have some sort of file-access restrictions in place. The exact methods are specific to each site and therefore difficult to document here.

Files larger than 33488896 octets (65535 blocks) cannot be transferred without client and server supporting blocksize negotiation (RFC1783).

October 1, 2003 TFTP (1)
shtml">manServer 1.07 from tftp.1 using doc macros.

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